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Question

A steam enters in an insulated nozzle with a velocity of 40 m/s. The initial pressure and temperature of the steam is 6.87 bar and 225C. It leaves at a pressure of 2.1 bar and a velocity of 450 m/s. The final enthalpy of the steam is
(At 6.87 bar and 225C,h=2850 kJ/kg)

A
3000 kJ/kg
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B
2749.55 kJ/kg
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C
2250 kJ/kg
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D
2698 kJ/kg
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Solution

The correct option is B 2749.55 kJ/kg

The steady flow energy equation,h1+c212+gz1+Q=h2+c222+gz2+WW=0,Q=0,g(z2z1)=0h2h1=c21c212h22850=(40)2(450)22×103h2=2749.55 kJ/kg

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